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52e9578985
This steals the "pickaxe" feature from JIT and make it available to the bare Plumbing layer. From the command line, the user gives a string he is intersted in. Using the diff-core infrastructure previously introduced, it filters the differences to limit the output only to the diffs between <src> and <dst> where the string appears only in one but not in the other. For example: $ ./git-rev-list HEAD | ./git-diff-tree -Sdiff-tree-helper --stdin -M would show the diffs that touch the string "diff-tree-helper". In real software-archaeologist application, you would typically look for a few to several lines of code and see where that code came from. The "pickaxe" module runs after "rename/copy detection" module, so it even crosses the file rename boundary, as the above example demonstrates. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#include "cache.h"
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#include "diff.h"
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#include "diffcore.h"
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#include "delta.h"
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static int contains(struct diff_filespec *one,
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const char *needle, unsigned long len)
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{
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unsigned long offset, sz;
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const char *data;
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if (diff_populate_filespec(one))
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return 0;
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sz = one->size;
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data = one->data;
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for (offset = 0; offset + len <= sz; offset++)
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if (!strncmp(needle, data + offset, len))
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return 1;
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return 0;
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}
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void diff_pickaxe(struct diff_queue_struct *q, const char *needle)
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{
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unsigned long len = strlen(needle);
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int i;
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struct diff_queue_struct outq;
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outq.queue = NULL;
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outq.nr = outq.alloc = 0;
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for (i = 0; i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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if (!p->one->file_valid) {
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if (!p->two->file_valid)
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continue; /* ignore nonsense */
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/* created */
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if (contains(p->two, needle, len))
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diff_queue(&outq, p->one, p->two);
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}
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else if (!p->two->file_valid) {
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if (contains(p->one, needle, len))
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diff_queue(&outq, p->one, p->two);
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}
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else if (contains(p->one, needle, len) !=
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contains(p->two, needle, len))
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diff_queue(&outq, p->one, p->two);
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}
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for (i = 0; i < q->nr; i++) {
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struct diff_filepair *p = q->queue[i];
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free(p);
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}
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free(q->queue);
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*q = outq;
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return;
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}
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